Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Allowance for doubtful accounts	$ 223	$ 465
Inventory reserves	445	479
Warranty liability	1,346	1,552
Deferred compensation	383	911
Pension and retiree health benefit obligations	7,072	8,615
Accrued vacation	631	570
Medical claims reserve	261	242
State net operating losses	2,633	2,167
Other accrued liabilities	746	1,583
Valuation allowance for state net operating losses	(1,374)	(830)
Total deferred tax assets	12,366	15,754
Deferred tax liabilities:
Tax deductible goodwill and other intangibles	(39,664)	(34,923)
Accelerated depreciation	(2,205)	(2,280)
Other	(592)	(556)
Total deferred tax liabilities	(42,461)	(37,759)
Net deferred tax liabilities	(30,095)	(22,005)
Operating loss carry forwards
State net operating losses	2,633	2,167
Valuation allowance for state net operating losses	1,374	830
State
Deferred tax assets:
State net operating losses	2,633
Valuation allowance for state net operating losses	(1,374)
Operating loss carry forwards
Operating loss carry forwards	58,246
State net operating losses	2,633
Valuation allowance for state net operating losses	$ 1,374